大だい冠かんむり

noun

kanji radical 大 when used as a crown (top component)

Refers specifically to the kanji component 大 when it appears at the top of a character, such as in 天, 夫, or 失. This is a technical term used in kanji dictionaries and calligraphy.

• 「天てん」の上うえの部ぶ分ぶんは大だい冠かんむりと呼よばれる。

  The top part of 天 is called 大冠 (daikanmuri).

• 漢かん字じ辞じ典てんで大だい冠かんむりの部ぶ首しゅを調しらべる。

  I look up the radical 大冠 in a kanji dictionary.